Railway traffic controlling apparatus



Dec. 10, 1957 A. E. Donn ETAL RAILWAY TRAFFIC coNTRoLLmG APPARATUS FiledDec. 22. 1953 lill! yUnited RAILWAY TRAFFIC CONTRULLNG APPARATUS ArthurE. Dodd, Edgewood, and .lames E. McMahon, Jr.,-v Penn Township,Allegheny County, Pa., assignors to Westinghouse Air Brake Company,Wittner-ding, Pa., a corporation of Pennsylvania Application December22, 1953, Serial No. y399,653

6 Claims. (Cl. 246-3) Our invention relates to railway traic`controlling apparatus and in particular to apparatus for remotelycontrolling a railway wayside signal and for supplying indications tothe control location of the condition of the remotely controlled signaland f traflic conditions in approach to that signal.

In:systems for controlling movements of trains or vehicles over astretch of railway track, it is often dcsir,

able to manually control a railway signal from a remote controllocation. When this is the case, it is also desirable for the operatorat the remote control location to be aware of the condition of theremotely controlled signal and also to be informed of the traflicconditions in approach to that signal so that he ican take proper actionin accordance with his information. Such arrangements are often used onstretches of track which are in approach to railway interlocking plantswhere many switching movements may be made and tratiic may be quiteheavy.

In such a situation a remotely controlled signal calledl trafficcontrolling apparatus requiring only two line wires l for remotelycontrolling a railway signal and for provid-j ing indications at thecontrol location of the signal condition and of traiiic conditions inapproach to the signal.

A further object of our invention is to provide in railway tratliccontrolling apparatus for remotely controlling a railway signal and forproviding means for indicating at the remote control point the signalcondition and the tratic condition in approach to the signal a linecircuit which may be energized from either end and which may further bepolarized at one end in order to etiect both the control and indicationfunctions.

According to our invention, we provide a control device such as arailway signal located adjacent a` stretch of railway track. We furtherprovide a first control relay and a signal control relay at the locationof the device. At a remote control location we provide a lirst and asecond indication relay and a control lever. A pair of controlconductors extend between the two locations. Means controlled in part bythe lever are provided for at times supplying energy from the devicelocation to the control location through the winding of the lirstcontrol relay to the first and second indication relays over the controlconductors so that either the irst control relay and the firstindication relay or the lirst control relay and the second indicationrelay will be picked up. We further provide means controlled in part -bythe lever for at other times supplying energy to the rates Patent O 2,8i d ,2 i Patented Dec. 1Q, i957 first indication relay and the signalcontrol relay from the control location over the control conductors. Atthe location of the device, means controlled by the signal control relayare provided for controllnig the device. At the control location weprovide indication means for f indicating the condition of the controldevice and of tratlic conditions in advance of the control devicecontrolled by the first and second indication relays and the lever.

Other objects of our invention will become apparent hereinafter as thecharacteristic features of construction and mode of operation of ournovel railway tran'c controlling apparatus are described in detail.

VThe single accompanying drawing is a diagrammatic View of railwaytrailic controlling apparatus embodying our invention for the remotecontrol of a railway signal and for providing at the remote controllocation indications of the signal condition and traffic conditions inapproachto the signal.

Referring now tothe drawing, a stretch of railwa track` made up of thetrack railsl and 2 is divided into a plurality offinsulated tracksections 6T, 7T, ST and 9T by insulated .joints 3 in the rails. 8T and9T are eachprovided with a track circuit including a track batterydesignated by the reference character TB with a prex corresponding tothe number of the' associated track section anda track relay designatedby the reference characterfTR with a prex corresponding to the number'ofthe associated track section. Trafic normally moves through the stretchin the direction indicated by the arrow, that is, from left to right. yA holding signal 7S is provided at the entrance end of section 7T.Located at this signal location are an approach relay 7AR, a firstcontrol `relay 7NLPR, a repeater relay 7NLPPR, a second control relay7NLPZR, a signal control relay 7HR, a signal control repeater relay'7l-IPR, a stick relay 7ASR, a time element lrelay 7TER, and a traiccontrolled relay 7HDR.

Relay 7HR is provided with two windings 4 and 5. Winding 4 has arelatively high resistance and winding 5 has a relatively lowresistance.

Time element relay 7TER is of the type having a nor- I mally open frontcontact a and a normally closed check' When rrelay 7TER becomesenergized ing'conta'ct b. checking'contact b will'immediately becomeopen but `front Contact a will not become closed until relay TER anormal or N position, two indicating positions A and B Associated withlever K are and a reverse or R position. a plurality of contacts 6through 11, here shown as circles with letters corresponding to theleverpositions in which the contacts will be closed. For example, contacts 8and 9 will be closed in the N position, the B position or in anyposition intermediate these two positions.'

Also disposed at the control location are an approach indication relay7APR, a signal indication relay 7RGPR, j

a repeater relay 7RGAPR, a stick relay 7AFSR, a signal repeater relayGHSR; a lever lock comprising the winding oflever lock LL, a pawl LD anda lever quadrant LQ; a signal indication lamp L1 and an approachindication lamp L2.

t Relays 7APR and 7RGPR are of the type which will pick up only whencurrent is owing through their wind- Track sections 7T,`

ings in a particular directionand will be released at all othertimes.Asv showninthedrawing, .relays .7ARRN and 7RGPR will pick up only whencurrent ows through their windings in the direction indicated by thelarrow.

yand 7RGPR in the direction described, relay 7APR will kbe -releasedandrelay 7RGPR will be picked up. With relay 7RGPR picked up a circuit isestablished passing from positive terminal EX of battery EB, over frontcon- Such relays are commonlyreferredttotasbiasedrelays and- 5 *tact aof relay 7RGPR, contact 9 of lever K and the will be so. referred tohereinafteninthis descriptionu Fur-Y winding of relay 7RGAPR to negativeterminal EO of thermore;,-re1ay.-,7APR.isof: the.-type:which,whenpiekedbattery EB. Accordingly, relay 7RGAPR is picked up up,rwill release.uponarelativelyasma'll predetermined-lre-l and a-circuitis establishedfor energizing indicating .lampy ductioninits..normal'operatingcurrentu. Scli=relaysare1 L1, which lamp whenlighted, indicates that signal 7S commonlyreferredtol'as.marginalmelayss .Accordinglyy l0 is'fdisplayingits red orstop aspect. The energizing circuit relay 7APR willbe referred:to.-hereinafter as ya-tbiasedfor lamp L1 may be traced from positiveterminalEX of marginal relay. Thecontrol:circuitstfor `relay 6HSR1 arevbattery EB, over front contact e of relay'7RGAPRI and not shown in thedrawing since they are conventionalfandf the lament of lamp L1 tonegative terminal EO of`batform, noparttoff ouninventiong 'Suceitltolfsayvflrelay tery EB.

HsRfwillzbeenergized Whenmsignal) 6S displays1otlier= 15 As was statedearlier in this description, relay 6HSR thanits stop or:redtaspectr,-.Lever quadrantLLQ is suitably is controlled by signal 6S in such amanner that it will connected to leverKrandrwillfhelmovecltto:predeterminedA be energized and picked up exceptwhen relay 6S ispositions-:shownzinthe.drawing.correspondingrtolthe'lever displaying itsstop aspect. With the stretch of track in positions.V.The:.-leverloc.king;means.a1isLsoarranged that advance ofsigna1-6Svacant, signalS will be displaying pawlLDwillinot, interfereWithathezmovementlolever= 20 itsproeeedor green aspectvand, accordingly,relay 6HSRy quadrantLQuand leverri'Kirom their:-N `to.theiriRpdsiJ--;Willtbe picked up." With VIrelay 6HSR picked up a circuit tionrbutfunctions to preventvtliermovementlof lever|1=K- isestablished-forsupplying energy to relay 7HDR whichl and quadrant Q from their Rposition':,pastftheiri'Bposify circuit may be traced frompositive'terminal EX ofbattion.-unless1ther.windinggofsleverAlockt.Llsfisenergizedto tery EB, over front contact a of relay 6HSR,front con-v liftrpawlsLD. outfo-.the notch inlleverLqnadrantrLQ. L 25tact a of relay TFR, thevwindinglof relay `7HDR fromOperatingenergy,atithessignalalocationrt'Sis-suppliedby rig-httoleft',front contact b of^relay 7 TR and front cona batteryWB havinga.positiveterminal;rWX vndlahn'egaL-w tactl b of.` relay GHSRY toynegative terminal EO of battery tive terminal WO.` Energyatztlieccontrolilocation isflsup- EB.'v With 'relay-VHDR supplied -withcurrent flowing pliedtby a batteryfEBlhaving-:alpositivexterminalSEXfandthroughits-'winding from right to left, its neutral contact anegativeterminal` EO.` lIt-vvill.befobvious thatilotherl 30 afwilll-be picked.upfand its-polar contact b will be in its sources;oflenerg-y may.besubstitutednforr.batteriesWBi leftr-handposition.l This will havenoimmediate'etect and EBr-in-lthis controliarrangementa on f the circuitarrangement.

Theapparatus: as showntin.zthedrawingszintitsnormal Having described theapparatusin its normal condicondition, .that-.is,.there lisnoetrainvorivehiclein .thestretch tion, let itnow be assumed that-atrain enters section of tracky and leverv Ki-s in;its normalorfNlpositionJ All 35 9Tr'and commences to travel through'the stretch inthe the trackl relays are energizedisozthat-theirsarmatureslare` normaldirection; Upon the ltrain-entering section 9T' piekedup; vWithtrackfrelaystSTRiand9I`Renergized, an` itsiwheelsandvv axles vwillshunt= relay'l9TR causing that energizing .circuitfforrelay7ARpassingtfromvpositivelten relayto release and l open the previouslytraced energizminal WX lof batteryy WB,.over;fr.ont contactxz'ofzrelayking# circuit for relayv 7AR. Accordingly, relay 7ARy 9TR, frontzcontacta yof relayy i8'l`'R',j1theswinding,0f relay' 40 will release andthereby reverse the polarity ofthe energy 7ARfront contactb of .relaySTR and: front contact 'bofy being supplieditotheline circuitl includingline lwires l5 relay 9TR to negative terminaLWO .of .battery :'WB Vitandlt'fand thereby reverse the direction of the ilow of closed. Forreasons-.whichlwill/become apparentasflthis current through thewindingsofrelays 7APR and 7RGPR. description proceeds-,theenergizingrcircuit forJrelay17HR, The energizing circuit for theserelays may now be traced which will be tracedsubsequentlyyisropen.and,..accord 45 from-positiveterminal WX of batteryWB, over front ingly, relay 7HR is released.. ItlwilLbe clear-.thainwith c'ontactb offrelayf7ASR, the winding of relay "NLPR, relay,7HR released, l,relayz7HPR;willfalso'berreleasedL back contact b ofrelay 7AR, front contact b ofl relay With relay f7HPR. released,an,,obviouscircuitfincludingf1 7NLPPR; line; wire 16,'contactv8 of leverK, the winding back contact c ofrelay,7H-PR;willlbe.closedforfsupplying' oflrelay7RGPRifrom right toleft, contact 7 of'lever K, energy to the red lampxRzofrsignalJS..Thislamp will 50 therwinding ofrelay. 7APR from right to left, line wiretherefore kbe lighted ,so thatsignal 7Sv willbezdisplaying` 15,frontffcontact'fav of-relay- 7NLPPR and back contact'a its redor stopfaspect. A; stick .circuitfor relay 17ASR ofrelay 7AR to'negativeterminal WO of batter-yA WB. passing ,from positive. terminal WX/ofbattery. WB; .over Itlwill -be lseen thatiafter the pole change relay-7NLPR backcontactb of, relay -7H'Pkfront.contact.afoffrelay'-willbe-energizedover the energizing circuit-which hasv 7ASR andthewinding ofsrelayJASR tonegative terminali 55 just been traced andwill'maintain fits' contacta closed. WO `of. battery WB is-als'oclosed.,f ,With relay @7ASR1 Therefore,its repeater. relay 7NLPPR willalso remain energized, relay 7TER.will beudeenergizedrbecause itsyenergized as just 'described Withrelay 7NLPPR`-re energizingcircuit,,whichjwillrbeL tracedubsequentlygis maining energized, relays7HR and'7HPR'will remain open atb'ackz contact a of lrelay/ASR:deenergized and signal 7S wilcontinue to displayits'sto'p Furthermore,`with.relay.-'7ASR energized, .a circuitwill 60 or red aspect. beestablished passing: from. positive. terminal WX4 -of- With ythereversal of the polarity-of thel current flowing batteryWB,over-fronttcontact boflrelayJASRythe windl through the windings 0frelays 7APR'aUd 7RGPR51'e1aY iHgDfLreIayJNLPR,frontzcomactatortreiay'vARgfront 7RGPR-will release and re1ay7APR'Wi11piCk up.Dur-vl contact aofirelayr'INLBPRjJipemire \15,'tl1`e`-windin`gfof" ingthe time'that these relaysA are transferring theircon` relay.7AP-R fromleft to right, contactJTof'leverKitheh tacts, relay 7RGAPR will bede'energized 'but dueto" winding of relay 7RGPRfr'om left to Tight;contact 8 ofV j lever K, line wire 16, frontecontac'tfb of relayA7NLPPRl and front contact b 'of relay TRT'to negative -'terminal' W0 ofbattery WB. It will beseen that lthe circ'uitfustraeed "i includes frontcontacts fa andb"of*`relayl";7NDPPR wlriclris 70 energized overafront'con'tactaof'relay The" manner in which relay' 7NIiPRinitially1-b'ecorries 'energized tocause relay 7NLP-PRftobeenergizedundr'tlfese conf' ditions will be made -clear as theddescription ,proceeds Wi'th'current owing through thejwindirgsofiielay'ZPR -7b its slow release characteristicyit'will not release andprior to the expiration of'its slow-release'time, relay" UAPR willcloseits front-contact ka and establish-a sec-- l ondenergizing circuit forrelay 7RGAPR passing from' positive terminal EXof 'batteryjEB,^ overfront contact av of relay 7APR, contact 9, andthe winding ofirelay'7RGAPR to'negative terminal E() of'battery' EB. Ac-- cordingly', relay7RGAPRwillf'rernain picked up'atths" time.v With relay 7RGAPR'remainingpicked' up; the4 previously tracedwenergizingcircuit' for lampL1 Awill remainclosed and that lamp will continue'to indicatethat signal7S is displaying its stop aspect. Furthermore, with relay'7APR nowpicked up an obvious energizing circuit including front contact b ofrelay 7APR will be established for energizing relay 7APSR. Accordingly,relay 7APSR will pick up and establish a stick circuit for maintainingit in its energized condition which stick circuit may be traced frompositive terminal EX of battery EB, over back contact a of relay 7RGPR,front contact a of relay 7RGAPR, front contact a of relay 7APSR and thewinding of relay 7APSR to negative terminal EO of battery EB. With relay7APSR picked up an obvious circuit including front contact b of relay7APSR will be established for energizing lamp L2 thereby indicating tothe operator at the control location that a train or vehicle isapproaching signal 7S. It will be obvious that relays 6HSR and 7HDR willremain in the condition they were in when the system was described inits normal condition.

Upon the train or vehicle entering section 8T, the wheels and axles ofthe train will shunt relay STR thereby maintaining relay 7ARdeenergized. There will be no other change in the circuits and,accordingly, While the train or vehicle occupies section 8T the systemwill remain in the condition it assumed when the train entered section9T. Therefore, as the train reaches signal 7S it will come to a stop.

If the operator at the control location decides to clear signal 7S sothat the train may proceed along the stretch, the operator will operatelever K to its reverse or R position thereby opening the contactsassociated with the lever which are not closed in the R position.Accordingly, at this time, the only contacts associated with lever Kwhich will be closed are contacts 6 and 10. For obvious reasons, it willbe seen that with contact 11 now open, lever lock LL will bedeenergized. Accordingly, pawl LD will drop into the notch in leverquadrant LQ and prevent lever K from being moved beyond its B position.With contact 9 of lever K now open the previously traced energizingcircuit for relay 7RGAPR will become open and relay 7RGAPR will releaseafter the expiration of its slow release time interval. Accordingly, theenergizing circuit for lamp L1 will become open and lamp L1 will becomedark. Furthermore, the previously .traced energizing circuit for supplyenergy to the Windings of relays 7NLPR, 7APR and 7RGPR connected inseries will now become open at contacts 7 and 8 and, accordingly, theserelays will all release. With relay 7APR released, the energizingcircuit for relay 7APSR will become open but that relay will remainpicked up because of its slow release characteristic. It should be notedthat prior to relay 7APSR releasing, relay 7APR will become reenergizedby means to be described below to reestablish the energizing circuit forrelay 7APSR. .t/lficcordingly, lamp L2 will remain steadily lighted atthis Upon relay 7NLPR releasing, the energizing circuit for relay 7NLPPRwill become open at front contact a of relay 7NLPR and relay 7NLPPR willrelease to thereby open its front contacts a, b and c and close its backcontacts cz and b. Therefore, an energizing circuit will becomeestablished for supplying energy to low resistance winding of relay 7HRconnected in series with relay 7APR which circuit may be traced frompositive terminal EX of battery EB, over back contact b of relay 7RGAPR,contact 6, the winding of relay 7APR from right to left, wire 15, backcontact a of relay 7NLPPR, back contact c of relay 7AR, winding 5 ofrelay 7HR, back contact b of relay 7NLPPR, wire 16, contact 10 and backcontact c of relay 7RGAPR to negative terminal EO of battery EB. It willbe clear that at this time, high resistance winding 4 of relay 7HR willbe short circuited by back contact c of relay 7AR. With relay 7APRenergized in series with low resistnce winding 5 of relay ?HR, theserelays will both pick up. Upon relayV apretar? 7HR picking "up,anenergizing circuit will be established for supplying energy to 4repeaterrelay 7HPR passing from positive terminal WX of battery WB, over check-`gized over a second energizing circuit including front contact a ofrelay 7HPR. Relay 7HDR will remain energized at this time in the mannerpreviously described and with relay 7HPR now picked up, a circuit willbe established for supplying energy to the green lamp G of signal7Slwhich circuit may be traced from positive terminal WX of battery WB,over front contact c of relay 7HPR, front contact a of relay 7HDR,left-hand contact b of relay 7HDR and green lamp G of signal 7S tonegative terminal WO of battery WB. Therefore, signal 7S will displayits green or proceed aspect and the train or vehicle may proceed overthe stretch past signal 7S.

Upon the train moving past signal 7S, its wheels and axles willl shunttrack relay 7TR and cause that relay to release, thereby opening theenergizing circuit for relay 7HDR to cause that relay to release.Accordingly, the circuit for lighting green lamp G of signal 7S will beopen and a second energizing circuit for red lamp R of signal 7S will beestablished which circuit may be traced from positive terminal WX ofbattery WB, over front contact c of relay 7HPR, lback contact a of relay7HDR and the red lamp R of signal 7S to negative terminal WO of batteryWB. It will be obvious that the remainder of the apparatus will remainin the condition last described until the train vacates section 8T andoccupies only section 7T.

When the train does vacate section 8T, the previously traced energizingcircuit for relay 7AR will become reestablished and relay 7AR will pickup. Upon relay 7AR picking up, a circuit will be established forsupplying energy to relay 7APR and the high resistance winding 4 ofrelay 7HR connected in series with the low resistance Winding 5 of relay7HR, which circuit may be traced from positive terminal EX of batteryEB, over back contact b of relay 7RGAPR, contact 6, the winding of relay7APR, wire 15, back contact a of relay 7NLPPR, resistor R, winding 4 ofrelay 7HR, Winding 5 of relay 7HR, back contact b of relay 7NLPPR, wire16, contact 10 and back contact c of relay 7RGAPR to negative terminalEO of battery EB. With this circuit established the current flow throughthe winding of relay 7APR will be sufficiently reduced to cause thatrelay to release due to its marginal characteristic. Upon relay 7APRreleasing, relay 7APSR will also release after the expiration of itsslow release time interval and thereby open the obvious energizingcircuit for approach indication lamp L2 which will go dark, therebyindicating that a train or vehicle is no longer approaching the signal7S. Asv

long as the train occupies section 7T the above described condition willbe maintained.

However, upon the train entering section 6T signal 63 will commencedisplaying its red aspect and relay 6HSR will release. Upon relay 6HSRreleasing there will be no immediate change in the apparatus since thefrom-.left toA right, front contact a of. .relay 7TR and i ing trafficmovements in the opposite direction cannot be operated until after theexpiration of the predetermined time lnterval. In this manner, the trainapproaching signal 7S will be given suticient time to comply with thestop aspect of signal 7S or, if the train should overrun that signal,tocause relay 7TR to release to thereby contrnue to prevent, through wellknown interlocking means, the signals governing trailic movements in thereverse direction from clearing to a proceed or an approach aspect.

Although we have herein shown and described only one form ofrailwaytraic controlling apparatus embodying our invention, it will beunderstood that various changes and modilications may be made thereinwithin the scope of the appended claims without departing from thespirit and scope of our invention. i Having thus described ourinvention, what we claim 1s:

1. In an arrangement for controlling from a remote control location adevice governing traffic movements overV a stretch of railway track andfor providing indications at said remote control location of thecondition of said device and of traiiic conditions in approach to saiddevice, a iirst control relay, a signal control relay having low andhigh resistance energizing paths, pole changing means responsive totraiiic conditions in approach to said device, said iirst control relay,said signal control relay and said pole changing means being situated atthe location of said device; a biased marginal relay, a second biasedrelay and a traic control lever at said control location; a pair ofcontrol conductors extending between said two locations; meanscontrolled in part by said lever and said pole changing means for `attimes supplying energy from the location of said device to said iirstcontrol relay, said biased marginal relay and said second biased relayover said control conductors; said last mentioned `means being etectiveto control the application of energy so that either said rst controlrelay and said biasedA marginal relay or said first control relay andsaid second biased're'lay will be picked up, means controlled by saidlever and said lirst control relay for at other times supplying energyfrom said control location to said biased marginal relay and said signalcontrol relay over said control conductors; said last mentioned meansbeing eiective when the stretch in `approach to said device is occupiedto cause energy to be supplied to a circuit including the low resistanceenergizing path for said signal control relay so that both said signalcontrol relay and said biased marginal relay will be picked up butoperative when said stretch in approach to said device is unoccupied tocause Venergy to be supplied to a circuit including the high resistanceenergizing path for said signal control relay so that the signal controlrelay will be picked up but said biased marginal relay will be released;means controlled by said signal control relay for governing theoperation of said device, approach indication means at said controllocation controlled by said biased marginal relay, and means forindicating the condition of said device; said biased marginal relay,said second biased relay and said lever each partially controlling saidlast means.

`2. In an arrangement for controlling from a remote control location adevice governing traic movements over a stretch of railway track and forproviding indications at said remote control location of the conditionof said governing device and of traic conditions in approach to saiddevice; a rst control relay, a signal control relay having a low and ahigh resistance energizing path, and pole changing means responsive totraitic conditions in approach to said device, all located at thelocation of said device; a biased marginal relay, a second biased relayand a traffic control lever at said control location; said trafficcontrol lever having lirst, second and third positions; a pair ofcontrol conductors extending between said two locations, meanscontrolled in part by said lever and said pole changing means for attimes supplying energy from said device location to said first controlrelay, said biased marginal relay and said second biased relay over saidcontrol conductors; said last mentioned means being effective, inaccordance with traffic conditions in approach to said device, to causeeither said rst control relay and said biased marginal relay or said rstcontrol relay and said second biased relay to be picked up; meanscontrolled by said lever and said first control relay for at other timessupplying energy from said control location to said biased marginalrelay and said signal control relay over said control conductors andeffective when the stretch in approach to said device is occupied tosupply energy to a circuit including f said low resistance energizingpath so that both said signal control relay and said biased marginalrelay will be picked up but effective when said stretch in approach tosaid device is unoccupied to supply energy to a circuit including saidhigh resistance energizing path so that the signal control relay will bepicked up but said biased marginal relay will be released; means forgoverning the operation of said device and controlled by said signalcontrol relay, approach indication means at said control locationcontrolled by said biased marginal relay; means for indicating thecondition of said device jointly controlled by said biased marginalrelay, said second biased relay and said lever; and means jointlycontrolled by said biased marginal relay, said second biased relay andsaid lever for preventing said lever from moving beyond said secondposition when it is in said third position.

3. In an arrangement for controlling from a remote control location adevice governing traflic movements over a stretch of railway track andfor providing indications at said remote control location of thecondition of said device and of traffic conditions in approach to saiddevice, a lirst control relay, a signal control relay and an approachrelay located at the location of said device, said signal control relaybeing provided with high and low resistance energizing paths, saidapproach relay being r responsive to traiiic conditions in approach tosaid device, pole changing means controlled by said approach relay;abiased marginal relay and a second biased relay located at said controllocation; a tratiic control lever having lirst, second and thirdpositions and located at said control location; a pair of controlconductors extending between said two locations, means controlled bysaid pole changing means for supplying energy from said device locationto said rst control relay, said biased marginal relay and said secondbiased relay through said control conductors when said first controlrelay is picked up and said lever is in said first or second position;said last mentioned means being effective in accordance with thecondition of said pole changing means to cause either said iirst controlrelay and said biased marginal relay or said rirst control relay andsaid `second biased relay to be picked up; means controlled by saidapproach relay and effective when said lever is in its third positionand said lirst control relay is deenergized for at other times supplyingenergy from said control location to said biased marginal relay and saidsignal control relay through said control conductors; said lastmentioned means being effective in accordance with the condition of saidapproach relay to include said high or said low resistance energizingpath for said signal control relay in series with said biased marginalrelay and the parts being so proportioned that, when the biased marginalboth said signal control relay and said biased marginal relay will bepicked up; means governing the operation of said device and controlledby said signal control relay, approach indication means located at saidcontrol location and energized when said biased marginal relay is pickedup, means located at said control location for 'i aisle-aw..

1x1 indicating;thercondition or? said. device and` energized.` when said:lever is-in saidrstorsecondposition .and eithersaidbiasedmarginal-relay orsaidselcond biased relayis-picked up,A leverlockingmean-s electivewhendeenen gized for preventing said. leverzfrom.movingcbeyond fits- 5a second-position when it is insaid-third:posit.ion .and-.means effective when either saidbiasedmarginalrelayorvspaid.. second biased relay is picked. up 4and said lei/er.' isina said. second position for energizing.. said..-lever: lockingy means.Y l

4. Infapparatus. for cont-rolling a^railwaywayside sig-1 nal locatedadjacent a -stretch i of railway.- track,.. a :traiicv control leverhaving irstY and1-second positions, abiased marginalmelay, a secondbiased relay,..t`1rstwandslecond control.` relays,I a sticky relay,means-:controlled vbyf. saidv 15.- stick relay `andsaid secondcontrolrelay forsupplying energy to -said-rst controlrelay; meansycontrolled by said stick relay, .said frstfcontrol relay, trafcconditions.y inapproach to Saidsignal and: said lever for-.supplyingenergy to said first control relay, said biased marginal. 20 relayfand`said. second lbiased relay 'in such .mannerfthat either` said rstfcontrol relay and. said' biased..margina1 relays or said'trst controlrelayand .said secondbiased relay will be coincidentlypicked up;indication -meansrfor indicating the condition ofsaid signal andcontrolled .25( jointly by said biased ymarginal relay,..said`second-fbiased relay-and saidy lever; a second indication meanscontrolled by.said-\'biased ymarginal relay forindicating. the.tra`1cconditions in approach to said signal, a signal control relay v,providedwith a low v.resistance energizingfpat-h. and y a -high resistanceenergizing path; means jointly controlled by said first controll relay,said leverand traffic conditions inf approach to -said signal forpicking up said biased marginal relay and said signal controlrelaythrough'its low resistance-path; means jointly controlled bysaid'first con- 35 trol relay, said leverand traffic conditions in approachto saidsignal for supplying energy to said biased marginal relay andsaid Vsignal control relaythrough said high resistance energizing path;said biased marginal relay having characteristics such that it will bereleased when. energized 40 v ill-:series with theihigh resistanceenergizing `path for said signal control relay, means controlled by-saidrst control relay= and=-.saidsignal control relay for energizing saidsecond-control relay; meansjointly controlled by said signal controlrelay, said second control yrelay and traic 45 conditions fin approachto said signal for energizing said stickerelay; a stick circuitrorsaidstickvrelay controlled byysaid-signal control relay,-and means'fordetermining th'ezcondition of-:saidfsignaland controlled -by said signalcontrol relay.

5. .In-apparatus for.-remotely controlling a signal vsituated-ata-signal'vlooation adjacent a stretch of railway track,atrac-control-lever havingfrst, second and third positions fandsituatedt-at a -control location; a biased .apapproach .indication relayof the marginal type; and a 55 biased signal indication relay located atsaid control locationgfgrst and`second` control relays and a stick relaylocatedfatl lthesignal location; la -pair of control conductorsyextendingfrom thecontrol location to the signallocation, anfapproachrelay energized `when and only when a portion-fofI said Istretch ofrailway track in approach to said signal isvacant, means effective whensaid stick relay is energized and saidY second control relay isdeenergized for supplyingenergy to said first control relay; meanseffective when said stick relay is energized, said approach relay isenergized, said rst control relay is energizedand said lever is insaidfirst or second position for supplying energyofone polarity to saidfirst control relay, said approach indication relay and said signalindication relay'connected in series and being respectivelyresponsive'to energy ofoppo- 7 0 site polarity so that said rst controlrelay andvsaid'signal indication-relay will be picked upand saidapproach indical tionrelay will be released; meanselectivecwhensaidstick relayis energized, said..approach relay is deenergized, saidrstfcontrolrelay is energized and saidleveris in said'lrst 75.

or-second position for. supplying energy of .opposite polarity? to4said-first control relay, said approachindication relays andAsaidifsignal indication relay connected .infseries'ls'f that saidfiirstcontrol relay an'dfsaid approachiindieationv relay-.lare picked up andsaid signal'indication relay.- `is freirv leased; signal indicationmeansat said-'controlflocatiorit for. indicating that said signal isdisplayingits 1stop aspectii airstf means -elective when saidsign'aLindicatioirrelayt isfpickedup and said lever is vinits'lrst=orf'secondfposiL tion for energizing said signal indicationmeans, a secondf meansretective when said' approach indicatioirrelayispicked Vup and said lever is in said rstor second positioni forenergizing said signal indication means, approachfindication means forindicating that said portiorofffsaid stretch in :approach to said signalis occupied,means efec" tive when said approach indicationrelayispickedfupforf energizing said approach indicationmeans,1leverf lockingmeans for preventing said lever from being moved beyond said ysecondpositionwhensaid lever is in lsaid third-'position and said leverlocking'means is deenergized', ineaus'y effective when said lever is insaid second positionfandv': eithersaid approach indication relay or saidsignal indicaf tion relay is picked up for energizing saidleveiilocking. means, a signal control relay'having ay low 'resistaric'eenergizing path and a high resistance` ener'gizingptlrrand! locatedatsaid signal location; means effective-'when lsaid 'I lever 'is insaidthird position, said r'st'control'relayi-'s' deenergized and saidapproach relay is deenergizedvfor supplying'energy to said approachindication'relayrandfL said signal control relay through its lowresistance energiz`- ing path so thatboth said -relays will be pickedup; means" effective when said lever is in said third position, saidfirstcontrol relay is deenergized, and said approach relay' isenergizedfor supplying energy to said approach 'indicav` tion relay and saidsignal control relay through its'--'high'V resistance path so that saidsignal control relay willbe' picked up but vsaid approach indicationrelay will'befrel' leased; means effective when said lirstcontroll relayor 'said signal control relay is energized for energizing' said second'control relay; means eiective when said signalcontrol'VI relay isdeenergized, said second control relay is deen'er'r-l gized and saidapproach relay is energized forenergizin'g said stick relay; a stickcircuit for saidstick'relayfclosdfi when said signal control relayisdeener'giz'ed'; andf-n'iean'lsf including said signal control relayforl controlling-rk said signal. Y

6. In apparatus -for remotely controlling Ia frailW'ayWay-v side signalsituated' atea signal location adjacent af strethf of railway track, a'trafc Vcontrol1 lever \having`rst',`seeon'd"f and third positions-andsituatedat a control locatonjla-'f biased approach Iindication relay ofthe marginal "type and a biased lsignal'indication relay bothsituated'atsaid-con trol location and `being respectively responsive,yto energy? of opposite polarity; rst yand second control relaysfandffa 1stick relayl situated `at thellocationofsaid signal,'.a'fp`ar3of controlconductorsV extending from ythe controlflocaftf'n' to the vsignallocation,v` an approach relay, me'ansleiectiy when and onlywhen aportion of 'said stre'tch"ot'rail'way track inv approach-to said `signalvisl vacant foi-'energizing said approach relay, means including yafront contactof saidstick relay and a back contact of said secondcontrol relay for supplying energy to said first control relay; meansincludingva front contact of said stick relay, a fronticon? tact of saidapproach relay, a front contact of'saidrs't control relay and a contactclosedwhen said lever is in*Y said first orsecond position for supplyingenergy ofone" polarity to said first control relay, saidapproach'indi'cation vrelay and said signal indication relay connectedin" series so ythat said rst control relay and said signal indicationrelay will be picked up and said approachv indication relaywill bereleased; means including a front 'con'- tact of said stick relay, aback contact ofvsaid approachrelay, a front contact of said rst controlrelay anda'y contact closed when said lever is in4 saidlrst or"sec'oi1d"position frsupplyingenergy' of opposite' polarity' tosaid rst controlrelay, said approach indication relay and said signal indication relayconnected in series so that said rst control relay and said approachindication relay are picked up and said signal indication relay isreleased; signal indication means for indicating, when energized, thatsaid signal is displaying its stop aspect, a first means including afront contact of said signal indication relay and a contact closed whensaid lever is in said first or second position for energizing saidsignal indication means, a second means including a front contact ofsaid approach indication relay and a contact closed when said lever isin said iirst or second position for energizing said signal indicationmeans, approach indication means for indicating, When energized, thatsaid portion of said stretch in approach to said signal is occupied,means including a front contact of said approach indication relay forenergizing said approach indication means, lever locking means forpreventing said lever from being moved beyond said second position whensaid lever is in said third position and said lever locking means isdeenergized, a first means including a contact closed when said lever isin said second position and a front contact of said approach indicationrelay for energizing said lever locking means, a second means includinga contact closed when said lever is in said second position and a frontcontact of said signal indication relay for energizing said leverlocking means, a signal control relay having a low resistance energizingpath and a high resistance energizing path; means including a contactclosed when said lever is in said third position, a contact closed whensaid rst control relay is deenergized and effective only when saidapproach relay is deenergized for supplying energy to said approachindication relay and said signal control relay through its lowresistance energizing path so that both said relays will be picked up;means including a contact closed when said lever is in said thirdposition, a contact closed when said first control relay is deenergizedand eiective only when said approach relay is energized for supplyingenergy to said approach indication relay and said signal control relaythrough its high resistance path so that said signal control relay willbe picked up and said approach indication relay will be released; a irstmeans including a front contact of said rst control relay for energizings aid second control relay, a second means including a front contact ofsaid signal control relay for energizing said second control relay,means including a contact closed when said signal control relay isdeenergized, a back contact of said second control relay and a frontcontact of said approach relay for energizing said stick relay; a stickcircuit for said stick relay including a contact closed when said signalcontrol relay is deenergized, and means including said signal controlrelay for controlling said signal.

References Cited in the file of this patent UNITED STATES PATENTS1,805,747 Whitehorn May 19, 1931 1,946,186 Bell Feb. 6, 1934 2,057,543Spray Oct. 13, 1936 2,176,611 Pelikan Oct. 17, 1939

